The ArmaLite AR-100 was an assault rifle based on the previous AR-16.
The weapon was intended to increase firepower of a squad as well as mobility.
[1] The ArmaLite AR100 is a 5.56×45mm NATO caliber short-stroke piston gas-operated, 5.56×45mm NATO assault rifle fed from 30- round and 100-round drum magazines that eject from the magazine insert when empty and are discarded during a firefight.
The AR-101 and AR-102 fire from closed bolt in semi-auto and open bolt in full auto whereas the AR-103 and AR-104 open bolt fire only.
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